Description
The Carrier HH18HA197 is an OEM limit switch engineered for use in Carrier furnace systems. Limit switches are a critical safety component in forced-air heating equipment, monitoring heat exchanger temperatures and shutting down the burner when unsafe temperature thresholds are detected — protecting both the equipment and the occupants.
Key Features
- OEM Carrier replacement limit switch for precise fit and performance
- Monitors heat exchanger temperature to prevent overheating
- Automatically interrupts burner operation upon detecting unsafe temperature levels
- Designed for reliable, long-term operation in forced-air furnace applications
- Direct OEM replacement ensures compatibility with original equipment specifications
Application
The HH18HA197 limit switch is a direct OEM replacement part designed for compatible Carrier furnace models. It serves as a primary high-limit safety device, opening the control circuit when the plenum or heat exchanger temperature exceeds the rated set point. Once temperatures return to a safe operating range, the auto-reset or manual-reset function (per design) restores normal operation.
Why Choose an OEM Limit Switch?
- Guaranteed compatibility with Carrier furnace control boards and wiring harnesses
- Maintains original equipment safety ratings and certifications
- Reduces the risk of nuisance trips or premature failure associated with aftermarket alternatives
- Supports warranty compliance on applicable Carrier equipment
Installation Notes
- Always de-energize the furnace before servicing or replacing the limit switch
- Verify model compatibility with the specific Carrier furnace unit before installation
- Consult the original equipment documentation for mounting location and wiring details
- A qualified HVAC technician should perform the replacement
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